Something easy, not difficult, not posing problems.

certainly, sure (said when granting a request) / no thanks is necessary; you're welcome (said in response to an expression of gratitude)

(military) The ground between trenches where a soldier from either side would be easily targeted.

(geology) a concretion of oxides of manganese and iron found on the floor of many oceans

(idiomatic, slang) Not a big deal, not something to worry about.

(slang) Expressing firm disagreement.

(US, chiefly Southern US) Any biting midge (family Ceratopogonidae), small flies (1–4 mm long); sometimes the species Leptoconops torrens in particular.

(slang) no problem

It does not bother me; I am not concerned. / It was no problem; not at all; you're welcome. / Do not worry, I will do it.

In a noble manner.